Ferroelectric phase transition in LaBSiO5 crystals from results of thermal and dielectric measurementsстатья
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Аннотация:The specific heat of the ceramic and the permittivity of a single-crystal sample of LaBSiO5, a new ferroelectric in the stilwellite family, were measured in a temperature range which includes the phase transition point (T-C = 140 degrees C). The excess entropy of the phase transition Delta S = 1.05 J/mol.K and the Curie-Weiss constant CC-W= 3.2 x 10(3) K were determined. The results indicate that the phase transition in this crystal is of a ”mixed” nature and exhibits features of a displacement-type transition and an order-disorder transition. (C) 1998 American Institute of Physics.